demand

  1. HoverSPRX

    Commercial Max Demand/Diversity Query

    Hello All, Iv been asked to pick up the remedials on someone else's EICR that was done last year on a school for Deaf Children. One of the items listed on the report is the conductors leading to the sub mains from the main panel are undersized. I popped the cover off to have a look and sure...
  2. C

    Current demand & load per phase Q

    Hi all, This is my first post on this forum. I'm currently doing my C&G 2365 and I've found myself completely stumped on a problem that's probably quite simple, but which I've had a lot of conflicting answers for from various people, which has left me a little confused. I'm working on a design...
  3. dc-electrix

    Maximum demand and diversity electric flat

    Hi All, Making some alterations in an existing flat and scratching my head about required supply to flat. It is all electric, 1 bed, 1 bathroom. Electric shower 9.5kw Instantaneous Water Heater 9.5Kw Cooker Oven & Hob 6Kw 1 Ring main 3 Electric Heaters...
  4. B

    Max Demand for mixed use commercial units

    Hi, Looking at a potential job. Agricultural buildings being divided into 10 mixed use units of around 1000 sq ft each. Present supply is a 100A TPN incomer. Future use of units is unknown at this stage, but planning is for B1 B2 so uses could be anything from a warehouse with a bit of lighting...
  5. Lekky1

    Exceeded max demand questions

    Hi guys, I have been asked to fit a ring main in a utility room currently being built with a outside socket and a lighting circuit with 4 led lamps and a outdoor light, this much I am comfortable with. My issue is with the max demand, The current consumer unit is loaded to the max with 212amp...
  6. J

    max demand for 12x all elec flats

    starting 12x flats next week that will be all elec -with a rather juicy electric boiler (12kw)- havn't won the intake/communal work yet- but just doing my pricing for it ready does my maths look good for working out the max demand and kva of main supply- currently it is only 100a TPN so around...
  7. Doomed

    odd demand from building company

    New build houses, full system boilers with the big cylinders with seperate thermal cut out and temperature probe which come with a pre fitted link connecting them. Have been told to remove this link and feed the main live feed for the whole system through it (after the fused switch spur) so if...
  8. T

    DCP 161 implementation April 1st and calculating KVA, maximum demand

    I have alluded to this in previous threads. The commercial site I work on has asked me what I think the total KVA for the site is. Having looked at various ways of viewing this I am getting lost with it. So if I just say kVA = ( V*A*1.73)/1000 and assume supply is 400V and take the main incomer...
  9. Michaelwgroves

    Complex Installations demand calc

    I've treated myself to the IET Electrical Installation Design guide. I've been looking at section 3.5 Complex Installations. There is a calculation for calculating demand based on number of dwellings in a group. Please see picture of relevant page. Seems simple, sub domain is 66.44A, demand...
  10. Dave301

    Max demand for Caravan site

    Hi there, Looking for some advice with a new caravan park. There will be 25 plots for static with a potential 15 being added in the future. SP Energy have quoted to supply 150KVA 3phase. Now I work that out to be 216A but will that be per phase. And also does anyone know where I might find...
  11. G

    Help with Maximum Demand needed

    Hi, I am studying to become an electrician. I got a question wrong on a practice test. Can anyone help me understand maximum demand. this is the question I got wrong..... Question 27: With reference to the nature of the supply, which one of the following can be determined by calculation...
  12. Cadgey123

    DNO maximum demand message.

    Just started doing my first block of flats as a Qualified supervisor. I have 5 flats and a landlords supply to wire up. Done my calculations a while back and told the DNO I would need require ADMD of 12.5 kva for each flat which I thought was reasonable, Considering I have 3 rings, 2...
  13. Ian1981

    After demand diversity

    Does anyone know the working method the supply companies use to calculate after demand diversity. Most new houses are supplied with 100amp fuses in the cut out. Now obviously the average houses don't come anywhere near using that amount of current, however the DNO must allow a working average...
  14. kingeri

    Maximum demand

    So now what's the feeling these days on working out maximum demand for domestics, the OSG method has to go out of the window surely, with more and more division of circuits going on. I have been pondering my latest job, very nice but older installation done by an old electrical engineer...
  15. J

    calculating total consumption for each of the circuits and final maximum demand curre

    I have to calculate the total consumption for each of the circuits and state the final maximum demand current. downstairs :2 fittings with 5x 12w lamps,1 fitting with 5 x 12w 1 fitting with 10 x 12w,1 fitting with 1 x 60w,1 fitting with 7 x 20w 2 fitting with 3 x 20w,1 fitting with 4 x 30w and...
  16. P

    Calculating total demand and diversity in single phase+three phase circuits.

    Good evening all, I just joined the community and I really hope I can contribute as much as I could be helped. Really. I'm completing my 2365 lvl3 course however I just got my 305 B assessment paper back. Apparently I didn't calculate well the max. Demand and diversity of a given circuit...
  17. J

    NICEIC Certification Scheme Max demand on eic for niceic ass

    Morning i have calculated my max demand as 69.6a (sum of mcb's x 0.4) and on my eic i have n/v the main head fuse- but on the sticker it says 60/80a (i know it could actually be 60 or 80 or 100 inside) this is the job i am using for my niceic initial assessment will this be asked about by...
  18. L

    Relay Help

    Hopefully someone can help me out please. We have installed a biomass system which feeds multiple properties. Each property has an s plan system. A 2 core signal cable is connected to the orange and brown cable on the 2 port valve at each property which sends a volt free signal back to the...
  19. B

    Domestic sub main to outbuilding

    hi guys new to this so sorry if revisiting old stuff. I need to run a sub main 200M from the service head to a log cabin Super eco all LED etc, so 40A 9Kw max demand if i use the cable calculators i get 185mm cable we all know power networks cover huge distance with 35mm cable on 100A supply...
  20. SJD

    Upgrading domestic supply (60A to 80 or 100A)

    For SSE DNO area, if a customer was to request an upgrade of supply from 60A to 80A (or 100A), does anyone know if SSE normally make a charge for doing this? Background: TN-S supply (Ze = 0.27 Ohm), late 1960's Bakelite-looking head which appears in good condition, mixture of 16 and 25mm2...
  21. S

    3 phase advice

    Hi, i require a little advice. 3 phase supply (100A per phase) from energy meter into 3 phase switched fuse isolator, then swa off to D.B 20 metres away. Distribution board feeds office equipment only. I need to install a supply for a 36kw 3p machine, which is going to be situated next to...
  22. M

    Maximum demand / diversity (commercial)

    In preparation of wiring up a commercial premises (function rooms / bars / restaurant area) I am trying to determine to what extent the existing 60A single phase supply might need upgrading. I have not had to do this myself for a commercial premises, and I am wondering if the same rules apply as...
  23. M

    Voltage drop

    Is there a voltage drop from DNO transformer to incoming supply? For a standard 100A supply to a house so they design cable to with stand no VD as so at maximum demand there will be no VD. It is then up to us to design circuits as to have as little as possible so that 230v remains everywhere. Of...
  24. S

    MAXIMUM DEMAND... nic assessment

    hi guys. if i calculate maximum demand like i got 6 circuit 32a cooker 32a upstairs ring 32a down s. ring 20a,radial 6a upstairs light 6a down stairs light get the higgest one and add the rest together get 40% of it and finally add to highest one.. do u thing is that right?? and also do...
  25. B

    meter tails and cut out fuse

    Hi people, I recently installed a cooker circuit in a property. The CU has 16mm meter tails supplying it with a 60A cut out fuse. I have read various opinions on this but: Should the meter tails be changed to 25mm even on a 60A fuse - in which case the fuse is not protecting the tails? or...
  26. L

    EICR meter tails coding

    Can anyone give me some advice on coding I recently carried out a EICR on a Commercial premises (communal areas of a block of flats) 3 x DB's all single phase with incoming 3 phase supply with 100A type 2 b fuses with 16mm tails going to each DB - personally I warrant this a code 2 any thoughts...
  27. A

    Advice on mains

    Hi guys, Just after some pointers. Looking to update fuseboard to my sisters property, needed a d/p isolator that was installed, and electricity board said main service head is porcelin and will need changing or new supply to propery as the original supply is looped from next door. most likely...
  28. P

    Domestic how do you work out maxium demand

    can you show me how to work out maxium demand on a lighting circuit with ten lights on the circuit please
  29. J

    EPC's a farce for remote areas where Solar PV helps the most!

    Any one agree? We installed 25 systems in the Isles of Scilly over a 3 month period, huge demand and interest in a small place that has an increasing problem with high demand but limited infrastructure, but no mains gas so no condensing boilers so no EPC rating of even 40! Bloody sad
  30. C

    Domestic RCD Rating

    Can someone please explain to me how the Rating of RCD work because I've read on different forums that you can not exceed the rating of the RCD ie 63A or 80A if that's the case why do C.U like 10 way dual RCD, have a total MCB rating of 218 A if all MCB was used and only 143 total A for the...
  31. S

    Domestic New assumed Current Demand of Installation

    OMG!! can somebody please point me in the right direction because i am sure that i am looking in the wrong section of the REGS book... here is my question... Explain with reasons the New Assumed Current Demand of the Installation? My answer is this... For economic and reliable design, the...
  32. E

    Cut-out fuse shared by 2 properties

    Hi All, Been to look at a job, where customer wants to install 9.5kw shower. 3 Bed 2 storey flat. Calculating the load on board at present with diversity comes out at 68.8A, if the shower was added calculations came to 94.6A. Looking in the meter cupboard, the supply splits to 2 meters after...
  33. K

    max demand cooker and heating system

    morning everyone could someone please help me on calculating max demand on a cooker ran off 6mm t&e off 40amp mcb, the cookers kw unknown but its older than grass!! also an old fashioned heating system ran off 2.5 t&e off a 16a mcb which circulates hot air through vents throughout the house...
  34. 1

    Domestic What's the highest you've recorded for a 100A fuse?

    Yes Maximum Demand again lol I just tried to make the title a little more curious to get people to look ;) Just playing with some maximum demand figures, started with 226A and got it down to 104.65A Just wondering what id the highest figure you have recorded for a 100A fuse? Is it actually...
  35. L

    Confused, can anyone shed some light?

    Hey, been to look at a job this evening its not your standard S, Y or Combi system. The plumbers gone in and only changed the boiler but disconnected all the cables to it. Scenario: Boiler, with pump above it, basic programmer (HW ON, CH ON) Then in the airing cupboard theirs one 2port valve...
  36. A

    Are PV panels cost effective to instal & run?

    ok I design house extensions, one of my clients just fitted 16 PV panels to their south facing roof in Somerset. Today at 2pm blazing sun, the elec meter seemed static. She turned the elec immersion heater on and the meter started moving forwards reasonably quickly, she turned it off and the...
  37. L

    NICEIC Certification Scheme Tony Cable & Maximum Demand on niceic video

    Watched the NICEIC's periodic inspection reporting dvd the other night, good overall and helpful but one thing I just cant agree with. I'm sure Tony Cable is a good electrician but when it came to the section on Maximum Demand he measured it with a clampmeter around the Line Tail and shouted "...
  38. V

    Domestic maximum demand 2011 for nic eic inspections

    hi guys with my yearly inspection comming up i have a job where ive installed a cooker circuit. 15 way cpn split c/u is the existing db in the house (small three bed only). it has 6 ring circuits 2 radials and 6 lighting circuits. (because it was 2 flats previously) my question is...
  39. J

    generator on remote farm

    hi guys new here. installing a 3 ph genny set on a remote farm.bells and whistles set. purchase from recivers so no history. but a very good set in a1 nick. got it working. its got plc control .sussed that out with help from DEEP SEA ELECTRONICS. what i am looking for is a unit that will kick in...
  40. B

    sub boards

    hello there everyone just got a quick question in regards to a new installation i am doing at the moment it is a manor house 20m in length. i was wondering whats the best way to go about it i would like to put a domestic board on each of the 3 floors and one in the basement is it best to...
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